Steam-boiler furnace



Oct. 29, H KERR STEAM BOILER FURNACE Filed Aug. 1 1925 2 Sheets-Sheet 1 INVENTOR 166M144 7 44). BY ATTORNEY ct. 29, 1929. H. J. KERR STEAM BOILER FURNACE Filed Aug. 1925 2 Sheets-Sheet 2 INVENTOR. 7' g ay. M BY %4 MM ATTORNEYS.

of any wel Patented Oct. 29, 1929 UNITED STATES PATENT OFFICE HOWARD J. KERR, 0F WEBTFIELD, NEW JERSEY, ASSIGNOR TO THE I BABCOCK & WIL- COX COMPANY, OF-IBAYONNE, NEW JERSEY, A. CORPORATION OF NEW JERSEY STEAK-BOILER FURNACE Application filed August 19, 1925. Serial No. 51,083.

My present invention relates to furnaces particularly adapted for use with steam boilers, and more particularly one in which fuel is burned on a mechanical stoker, especially if the combustion air is supplied under pressure. My invention will be best understood from the following description and the annexed drawings showing an illustrative embodiment of my invention.

In the drawings, Fig. 1 is a side sectional elevation on the line 1-1 of Fig. 2 of an illustrative embodiment of my invention with the upper art of the boiler, which may be l known form, broken away, and Fig. 2 is a view from the right of Fig. 1 of a part of the arrangement shown in Fig. 1.

Like reference characters indicate like parts in the different views.

In the arrangement illustrated in the drawings, the furnace chamber is provided with a chain grate stoker 11 which may be provided with ducts (not shown) for supplying air under pressure to the space between the upper and the lower runs of the grate. A combustion arch 12 extends over the front part of the grate 11 and from the inner end of the arch extends upwardly and outwardly the front furnace wall 13. The rear furnace wall 14 has its inner face at the lower )art, then ext-ending inwardly or forwardly ior a short distance and then diverging outwardly up to the furnace gas exit.

Above the furnace chamber is a water tube boiler of a well-known form with downtake headers 15 and uptake headers 16 connected by water tubes ll. On the'lowermost row of water tubes is a longitudinal baffle 18 forming a part of the furnace roof, a baflie 19 extending upwardly from the inner end of the bafiie 18 tov form with the header 16, an upward pass for the gases across the water tubes. Since my present invention is not concerned-With the particular type of boiler used in connection with the furnace, further description of the boiler will be unnecessary.

Extending across the lower part of the rear wall 14 is a header 20 which may be connected to any suitable source of water supply. Connected to the header 20 at their lower ends and to the mud drum 21 of the boiler at their upper ends is a plurality of curved tubes 22 which are arranged as best shown in Fig. 1, so that the lower part of such tubes projects inwardl and upwardly over the rear end of the sto er 11 and then, in a wide sweeping curve up to the mud drum 21, the upper part of the tubes 22 extendin across the path of the gases flowing from t e stoker into the outlet from the furnace chamber which, of course, is also the inlet to the spaces around theboiler tubes, the battle .18 directin the gases from the furnace chamber intot 11S outlet.

()n the lower part of the tubes 22 is placed a layer of tile forming a furnace arch 23, this arch extending to apoint sufliciently high in the furnace chamber to provide a reflecting surface to throw the heat downward on the fuel being burned, the tubes 22 on which the arch 23 is sup orted serving to kee the arch 23 cool and also, in connectionwit the arch itself, protecting the rear furnace wall from the intense heat from the fuel.

At the lower end of the arch 23 is a series of chutes 24 convenient] built in the rear wall and connecting with sheet metal hoppers 25, these hoppers having outlet pipes 26. The rear wall is also provided with a series of openings, each with a suitable closure, the openings 27 being located above the lower surface of the arch 23 and the openings 28 extending below the lower end of the arch 23, so that by the former openings, access to the upper'surface of the arch may be had and through the lower openings, access to the rear end of the grate 11. A dust blower 29 may 'be located behind the upper part of the arch 23.

With certain grades of fuel, and particularly when burned under pressure conditions, particles are thrown up from the fuel bed which, if permitted to enter among the boiler tubes, become chilled and harden thereon to form a slag deposit. With the arrangement which I have described, these particles, in passing between the tubes 22, will be somewhat cooled and will have a tendency to fall out of the gas stream onto the upper surface of the arch 23, this falling out being assisted by the form of furnace chamber which, it will be noted, is wide at the bottom and at the top with a constricted throat at about its midsection. This form of chamber creates a thorough mixture and a turbulence in the gas streams, so that not only is better combustion produced, but the solid particles are given a direct-ion of motion other than upward, so that they may strike against the rear wall and fall to the arch 23.

The dust and slag particles which have been made non-adherent by their chilling in passing between the tubes 22, will accumulate on the top of the arch 23 and slide into the chutes 24 and the hoppers The blower :29 may be used to assist the cleaning of the arch 23 and if for any reason there is an accumulation which it is diflicult to remove by means of the blower 29,- the openings 27 atford means by which such deposits may be drawn into the chutes 24 by any suitable tool.

By giving the tubes 22 the long, easy reversed curve shown, the tube is not only carried well out into the combustion chamber into the desired position for supporting the arch 23, but it will also permit motion of the boiler with respect to the box without straining the connections between the tubes 22 and the header 20 and mud drum 21. I

It will be understood that the arrangement which I have described is merely illustrative and that the embodiment of my invention may be widely varied. It will further be an derstood' that some of the features of my invention may be used independently of other features.

I claim 1. In a boiler furnace, a stoker and a stoker arch at the rear of the furnace chamber, said arch comprising a plurality of tubes extending along a wide swee ing curve from the lower rear part of the urnace chamber forwardly and upwardly into the furnace chamber and then rearwardly and upwardly with their upper 7 ends connected to the boiler spaces, and tile supported on the lower portions of said'tubes and extending from the rear furnace wall into the furnace chamber, said tubes being spaced apart to permit the furnace gases to rise between the portions of said arch tubes above the tile.

2. In a boiler furnace, a Stoker and a stoker arch at the rear of the furnace chamber, said arch comprising a plurality of tubes extending along a wide sweeping curve from the lower rear part of the furnace chamber forwardly and upwardly into the furnace chamher and then rearwardly and upwardly with their upper ends connected to the boiler spaces. tile supported on the lower portions of said tubes and extending from the rear furnace wall into the furnace chamber. said tubes being spaced apart to permit the furnace gases to rise between the portions of said arch tubes above the tile, dust chutes in the rear furnace wall to receive dust collecting on the upper surface of said tile, and openings in said furnace wall through which access may be obtained to said tile,

3. Ina boiler furnace, a stoker and a stoker arch at the rear of the furnace chamber, said arch comprising a plurality of tubes extending along a wide sweeping curve from the lower rear part of the furnace chamber forwardly and upwardly into the furnace chamber and then rearwardly and upwardly with their up er ends connected to the boiler spaces, ti e supported on the lower portions of said tubes and extending from the rear furnace wall into the furnace chamber, said tubes being spaced apart to permit the furnace gases to rise between the portions of said arch tubes above the tile, dust chutes in the rear furnace wall to receive dust collecting on the upper surface of said tile, and a soot blower to blow the dust-along the upper surface of the tile into said chutes.

4. In a boiler furnace, a Stoker, a furnace roof arranged to direct the gases from the stokcr to a gas outlet at the rear part of the top of the furnace chamber, a stoker arch at the rear of the furnace chamber, said arch comprising a plurality of tubes extending in a curve from the lower rear part of the furnace chamber forwardly and upwardly into the furnace chamber and then rear-wardly and upwardly with their upper ends connected to the boiler spaces, and tile supported on the lower portions of said tubes and extending from the rear furnace wall into the furnace chamber, said tubes being spaced apart and positioned so that their upper portions above the tile are in the path of the gases flowing to said gas outlet.

5. A boiler furnace having the top and the bottom of the chamber larger than the mid section thereof with the rear and front walls of the furnace chamber inclined toward each other at the lower part of the furnace cham her up to said mid-section and then away from each other above said mid-section, a stoker in the lower part of the furnace, a furnace roof to direct the gasesfrom the stoker to a gas exit at the upper rear part of the furnace chamber, arch tubes extending from the rear furnace wall upwardly and forwardly above the rear of said Stoker and then upwardly and rearwardly toward the rear furnace wall with their upper ends connected to the boiler spaces, and tile on the lower portions of said tubes to form an arch over the rear of the stoker, with the to of the arch at said narrow mid-section of t e furnace chamber.

6. A boiler furnace having the top and the bottom of the chamber larger than the midsection thereof with the rear and front walls of the furnace chamber inclined toward each other at the lower part of the furnace chamher up to said mid-section and then away from each other above said mid-section, a

stoker in the lower part of the furnace, a furnace roof to direct the gases from the stoker to a gas exit at the upper rear part of the furnace chamber, arch tubes extending from the 5 rear furnace wall upwardly and forwardly above the rear of said stoker and then upwardly and rearwardly toward the rear'furnace wall with their upper ends connected to the boiler spaces, and tile on the lowerportions of said tubes to form an arch over the rear of the stoker, with the top of the arch at said narrow mid-section of the furnace chamber, said tubes being spaced apart with their upper portions extending across the path of the gases flowing to said exit.

7. Ina boiler furnace, a chamber having wide bottom and top portions connected by a constricted throat, a grate in the bottom portion, a plurality of tubes extending into said bottom portion and upwardly and Forwardly and then upwardly and rearwardly through said throat toward a wall of the chamber, whereby the upper portions of the tubes are vertically above the lower portions thereof, and tile supported on said lower portions of the tubes, whereby slag particles passing between the upper portions of the tubes may be guided bysaid wall through U saidthroat onto said tile.

HOWARD J KERR. 

